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• Jen
• March 23, 2017



How to Understand Your Current Tire Size

Knowing your Jeep's tire size can be essential information when it comes time to replace that rubber, or even if you ever decide to change wheels. And while a stock tire size is imprinted right inside the driver side B pillar, you may not know what if have if you are not the original owner.

So here is some helpful information to assist you in determining what you currently have on the vehicle.

First, the sidewall of your tire contains all the information needed to understand everything about that specific tire. All tires are required to have this information, regardless of the manufacturer brand name.

Now, this information could read in a few different ways. For example, it could simply say 35x12.5 R17, or it may show as P265 75 R15. If it is the first listing, then here is the breakdown. That first number is your tire size at 35", and then the second number tells you the tire width at 12.5". That third reading is the tire type as radial and diameter as 17".

The second listing is a metric set up, and is what is more common on factory-type sized tires. From left to right, the P indicates a passenger tire while 265 indicates the tires width in millimeters. That 75 is the tire's aspect ratio and simply means the tire's height is equal to 75 percent of its width. Finally, like the first set of numbers, that R15 means it is a radial tire and has a 15" diameter.

For those who have the metric reading on their tires, you can simply plug that into the conversion calculator to determine the tire size, or find that corresponding reading on one of the below conversion charts.

Metric to Standard Conversion

Enter the metric size (i.e. 285/75 R17)

15-inch Wheel Conversion Chart

Metric to Standard Tire Conversion Chart for 15 inch Wheels

Metric	Standard
215/75/15	27.7"x 8.5"
225/70/15	27.4"x 8.9"
225/75/15	28.3"x 8.9"
235/75/15	29.0"x 9.3"
245/75/15	29.5"x 9.6"
255/75/15	30.0"x 10.0"
265/75/15	30.6"x 10.4"

16-inch Wheel Conversion Chart

Metric to Standard Tire Conversion Chart for 16 inch Wheels

Metric	Standard
205/85/16	29.7"x 8.1"
215/75/16	28.7"x 8.5"
225/70/16	28.4"x 8.9"
225/75/16	29. 2"x 8.9"
235/70/16	29.0"x 9.3"
235/85/16	31.7"x 9.3"
245/70/16	29.5"x 9.6"
245/75/16	30.5"x 9.6"
255/70/16	30.0"x 10.0"
265/70/16	30.6"x 10.4"
265/75/16	31.6"x 10.4"
275/70/16	31.2"x 10.8"
285/75/16	32.8"x 11.2"
295/75/16	33.4"x 11.6"
305/70/16	33.0"x 12.2"
315/75/16	34.8"x 12.4"
375/55/16	32.8"x 15.5"
395/70/16	37.9"x 16.0"

17-inch Wheel Conversion Chart

Metric to Standard Tire Conversion Chart for 17 inch Wheels

Metric	Standard
245/70/17	30.6"x 9.8
265/70/17	31. 6"x 10.7
285/70/17	33.0"x 11.5
315/70/17	34.4"x 12.4

18-inch Wheel Conversion Chart

Metric to Standard Tire Conversion Chart for 18 inch Wheels

Metric	Standard
275/65/18	32.1"x 11.0
375/50/18	33.0"x 15.4
325/60/18	33.2"x 13.3
325/65/18	34.8"x 13.5
305/70/18	35.0"x 12.2
375/60/18	35.7"x 15.5
395/65/18	37.8"x 15.7

20-inch Wheel Conversion Chart

Metric to Standard Tire Conversion Chart for 20 inch Wheels

Metric	Standard
325/50/20	33.0"x 13.2"

Metric measurement example: 225/70R15

225 = Section width in millimeters

70 = Aspect ratio (ratio of section height to section width)

R15 = Rim diameter

R = Radial Construction, B = Bias Construction, D = Bias Belted Construction




Calculations for Measurements

Tire Width: Section width divided by 25. 4 (Ex: 225 / 25.4 = 8.86")

Section Height: Tire width times aspect ratio (Ex: 8.86" x 70% = 6.20")

Overall Diameter: Section height times 2 plus rim diameter (Ex: (6.20" x 2) + 15 = 27.40")

See all tires here




Related Articles:

When Is It Time To Change My Jeep's Tires?

Choosing The Best Jeep Tires

How Do You Rotate Jeep Tires?

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Wheel width, tire profile height. Tire index tables.

For example: you have a 175/70 R13 wheel on your car. Using this table, we determine the profile height of your tire 175 by 70, we get 12.2 cm. If you want to put the tire wider and leave the wheel height the same, then select a value close to 12.2 from the table.
We get the size 205/60 R13. If you want to increase the size of the disk, leaving the wheel height the same, the following calculations are necessary: ​​175/70 R13 the profile of this wheel according to the table is 12.2 cm, multiply it by 2 because. wheel height consists of two profile values ​​12.2x2=24.4 cm. Next, add the size of the disc, R13 is 13 inches, convert to cm. 13x2.54=33cm. Then add the two values ​​24. 4+33=57.4cm. this is the full height of the wheel. Now, having done some simple calculations, you will understand that you can put 195/50 R15 or 185/60 R14, for these sizes, the wheel height is about the same - 57cm. But we should not forget that with an increase in the width of the tire, it is desirable to increase the width of the disk. Usually, the standard wheel height on the machine can be increased by 1, maximum 2 sizes. Before you change the dimension of the wheel, you can always consult with our highly experienced specialists. In some cases, the car has regular wheels of the same radius, but different widths, and the height of the wheels must be the same. (BMW 7 SERIES front 235/50 R 18, rear 255/45 R18). For all these calculations, this table was created.

Wheel width, profile height in mm.

shk	155	165	175	185	195	205	215	225	235	245	255	265	275	285	295	305	315	325
vp
30											7. 6	7.9	8.2	8.5	8.8	9.1	9.4	9.7
35									8.2	8.6	8.9	9.3	9.6	10	10.3	10.7	11	11.4
40						8.2	8.6	9	9.4	9.8	10.2	10.6	11	11.4	11.8	12.2	12.6	13
45					8.8	9.2	9.7	10.1	10.6	11	11.5	11.9	12.4	12.8	13. 3	13.7	14.2	14.6
50					9.8	10.2	10.7	11.2	11.7	12.2	12.7	13.2	13.7	14.2	14.7	15.2	15.7	16.2
55				10.2	10.7	11.3	11.8	12.4	12.9	13.5	14	14.6	15.1	15.7	16.2	16.8	17.3	17.9
60			10.5	11.1	11.7	12.3	12.9	13.5	14.1	14.7	15.3	15.9	16.5	17.1	17. 7	18.3	18.9	19.5
65	10	10.7	11.4	12.6	12.8	13.3	14	14.6	15.3	15.9	16.6	17.2	17.9	18.5	19.1	19.8	20.5	21.1
70	10.8	11.5	12.2	12.9	13.6	14.3	15	15.7	16.4	17.1	17.8	18.5	19.2	19.9	20.6	21.3	22	22.7
75	11.6	12.4	13.1	13.9	14.6	15.4	16.1	16.8	17.6	18.4	19.1	19.9	20. 6	21.4
82	12.7	13.5	14.3	15.2	16	16.8	17.6	18.4	19.3	20	20.1	21.7	22.5

sh - wheel width, vp - profile height

Load indices

load index	tire load, kg	load index	tire load, kg	load index	tire load, kg
62	265	88	560	114	1180
63	272	89	580	115	1215
64	280	90	600	116	1250
65	290	91	615	117	1285
66	300	92	630	118	1320
67	307	93	650	119	1360
68	315	94	670	120	1400
69	325	95	690	121	1450
70	335	96	710	122	1500
71	345	97	730	123	1550
72	355	98	750	124	1600
73	365	99	775	125	1650
74	375	100	800	126	1700
75	387	101	825
76	400	102	850
77	412	103	875
78	425	104	900
79	437	105	925
80	450	106	950
81	462	107	975
82	475	108	1000
83	487	109	1030
84	500	110	1060
85	515	111	1090
86	530	112	1120
87	545	113	1150

Speed ​​indices

speed index	speed, km/h	speed index	speed, km/h
J	to 100	S	to 180
K	to 110	T	to 190
L	to 120	H	to 210
M	to 130	V	to 240
N	to 140	W	to 270
R	to 150	Y	to 300
Q	to 160	VR	over 210
R	to 170	ZR	over 240

table with all tire sizes




• Introduction

• How to decipher the marking of motorcycle tires

• Correspondence table for metric and inch tire marking systems

• Conclusion




Motorcycle tires are impossible to choose correctly if you do not understand their sizes. Otherwise, at best, you risk bringing just a useless piece of rubber from the store. To determine the sizes, we have prepared a short decoding method and a comparison table of tire dimensions.

Any motor rubber has a sea of ​​​​information on the sidewall about the properties, purpose and, of course, size. We need to figure it out, and then compare the readings with the table. You can learn more about motorcycle tire labeling in our previous article.

As a rule, the main marking on the side of the tire looks like this: 120/80 R16 59S. This is the so-called metric marking. Let's understand it in more detail:

• 120 - profile width from edge to edge of the tread, expressed in millimeters.

• 80 - profile height, expressed as a percentage.

• R - radial type of construction.

• 16 - diameter of the landing area. This indicator should correspond to the same diameter of the rim on which the tire will be put on.

• 59 - load index, or the maximum weight that the tire can withstand without loss of performance. We are looking for it in the table:




Tire load index
40	140	53	206	66	300	79	437
41	145	54	212	67	307	80	450
42	150	55	218	68	315	81	462
43	155	56	224	69	325	82	475
44	160	57	230	70	335	83	487
45	165	58	236	71	345	84	500
46	170	59	243	72	355	85	515
47	175	60	250	73	365	86	530
48	180	61	257	74	375	87	545
49	185	62	265	75	387	88	560
50	190	63	272	76	400	89	580
51	195	64	280	77	412	90	600
52	200	65	290	78	425	91	615


S is an index of the speed at which the bike can move without losing ride stability, grip and other useful tire characteristics. The value is also in a special table:

The models in the top are arranged in terms of price / quality ratio. In the process of writing it, we were guided by the reviews of amateur bikers, professional tests, and were also guided by our own subjective opinion and many years of experience with tires.

Speed ​​index	Maximum speed, km/h
A	40
B	50
C	60
	65
E	70
F	80
G	90
J	100
K	110
L	120
M	130
N	140
P	150
Q	160
R	170
S	180
T	190
U	200
H	210
V	240
W	270
Y	300
VR	>210
ZR	>240
(W)	>270
Z	>300


This method of labeling tires is followed by most manufacturers, but there are those who prefer alternative types, where the dimensions are indicated in inches. For example, this one is 3.25H-19. Everything is simple here: 3.25 is the tire width expressed in inches, H is the speed index, 19 is the bore diameter.

Sometimes an inch designation can be placed instead of the usual millimeter, for example, like this: 4.60/80 R16.

There is a rather rare alpha system created mainly for sports tourists. For example, this type of MM90S-16, where: MM - profile width in inches (3.75), 90 - profile height in percent; S - speed index, 16 - diameter of the landing rim of the tire.

Marking alpha	Width in inches
MG	2.75
MH	3.00
MJ	3.25
ML	3.50
MM	3.75
MN	4.00
MP	4. 25
MR	4.50
MS	4.75
MT	5.00
MU	5.50
MV	6.00


To make it easier for you to determine what the inch size corresponds to in the metric system and vice versa, we have prepared a comparison table for you.

Tire size in.	Load index		Permissible rim width, inch.	Tire size
				Alpha	Metric
	Standard	Reinforced.			100	90	80
2. 75-16	40	46	1.50-1.85	MH 90-16	80/100-16	80/90-16	90/80-16
3.00-16	40	48	1.60-2.15	MH 90-16	90/100-16	90/90-16	100/80-16
3.25-16	48	55	1.85-2.50	MJ 90-16	100/100-16	100/90-16	110/80-16
3.50-16	52	58	1.85-2.50	ML 90-16	100/100-16	100/90-16	110/80-16
4.60-16	58	59	1. 85-3.00	MM 90-16	100/100-16	110/90-16	120/80-16
2.75-17	41	47	1.50-1.85	MH 90-17	80/100-17	80/90-17	90/80-17
3.00-17	41	50	1.60-2.15	MH 90-17	90/100-17	90/90-17	100/80-17
4.50-17	50	67	2.15-3.00	MR 90-17	110/100-17	130/90-17	140/80-17
4.60-17	50	62	1. 85-3.00	MS 90-17	100/100-17	110/90-17	120/80-17
5.10-17	50	67	2.50-3.50	MT 90-17	110/100-17	130/90-17	140/80-17
2.75-18	42	48	1.50-1.85	MH 90-18	80/100-18	80/90-18	90/80-18
3.00-18	47	52	1.60-2.15	MH 90-18	90/100-18	90/90-18	100/80-18
3.25-18	52	59	1. 85-2.50	MJ 90-18	100/100-18	100/90-18	110/80-18
3.50-18	56	62	1.85-2.50	ML 90-18	100/100-18	100/90-18	110/80-18
3.60-18	51	62	1.85-2.50	MH 90-18	100/100-18	90/90-18	100/80-18
4.00-18	64	69	2.15-3.00	MN 90-18	110/100-18	120/90-18	130/80-18
4.10-18	60	69	1.85-3.00	ML 90-18	100/100-18	100/90-18	110/80-18
4. 25/85-18	64	69	1.85-3.00	MM 90-18	110/100-18	110/90-18	120/80-18
4.25-18	66	69	2.15-3.00	ML 90-18	110/100-18	120/90-18	130/80-18
4.60-18	63	69	1.85-3.00	MR 90-18	110/100-18	120/90-18	130/80-18
3.00-19	49	54	1.60-2.15	MH 90-19	90/100-19	90/90-19	100/80-19
3. 25-19	54	54	1.85-2.50	MJ 90-19	100/100-19	100/90-19	110/80-19
3.50-19	54	57	1.85-2.50	ML 90-19	100/100-19	100/90-19	110/80-19
3.60-19	52	54	1.85-2.50	MH 90-19	100/100-19	90/90-19	100/80-19
2.75-21	45	54	1.50-1.85	MH 90-21	80/100-21	80/90-21	90/80-21
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